CVE-2026-5321: vanna-ai vanna FastAPI/Flask Server cross-domain policy

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-02 · updated 2026-06-17
Weakness: CWE-346

Description

A flaw has been found in vanna-ai vanna up to 2.0.2. Affected by this issue is some unknown functionality of the component FastAPI/Flask Server. Executing a manipulation can lead to permissive cross-domain policy with untrusted domains. The attack can be launched remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products

vanna-ai vanna: 2.0.0, 2.0.1, 2.0.2

References

https://github.com/August829/CVEP/issues/14
https://vuldb.com/submit/780729
https://vuldb.com/vuln/354653
https://vuldb.com/vuln/354653/cti

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